Emile girardeatj



E. GIRARDEAU. Y DYNAMO lN COMBTNATION WITH AUTOMATIC SWITCH.

APPLICATION FILED MAR. 11, 19W. 1,193,537. Patented Aug. 8,1916.

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Specificaiion of Letters Patent.

EMILE GIRARDEAU, OF PARIS, FRANCE.

DYNAMG m ccmnrnn'rxon'wrr AUTOMATIC SW TCH.

- rammed Au 8. 1916.

Apglication filed March 11, 1916. Serial N0. S3,535.

To all whom it may concern I :32 n, known that I, EMILE'CIRARDEAL en gineer, residing ch Rue Aubcr, in Paris,

France have invented new and useful Im- 4 provernents in Dynamos in Combination with Automatic Switches.

The combination of a dynamo with cm;- in and a cut out device, for any purposes, and particularly for charging thenccumulators, is wellknown. This simplifies the whole installation, reduces the space required and is especially suitablc for the use of small power dynemos, like the ones usu* ally employed for motor car lighting.

- In previous arrangements-the field-poles of the dynamo talcc'the place of the thin wire electromagnet of the ant-emetic cut-in and cut-out. The charging circuit is closed as soon as'the generator reaches e ceri'ain speed since .the magnetic force 0.f the field poles is then sulficicnt to attract an 1r0n slip specially armature over" it. The protection of the Y cableas soon as the speed of the designed or this purposes-rid to form an dynamo againstvrei'ersecurrent .is assumed by a small auxiliarycoil connected int-he charging circuit and wound on the above mentioned armature, the connections being disposed such a way that the effect of their windings assists the one of the field ioies when the, voltage of the generator higher than the elcctromotii'e power of the storage battery and in the reverse case, has

on the contrary a diiforent result opposing the direction of the magnetic'fiux of the armature, causing then 11. sudden breaking of the [charging current. This disposition, andthe similar ones, can only worh'setisfactorily when the flux? in the field-poles can be kept nearly constant, but is impractigenerator is subject to large variations.

In mug] in order to 'keepilie QlBCt-IUYQO: 't-ive force neariy crmstant, the flux produced by the field pole windings must be reduced proportionally to the speed and ccnsequcntiy' the fin becomes, tily too Weak to keep ihe. clm-rging circuit closed. T51 p ent invention olefin-fies this important 1 convenience.

As pi'ii'sciple mists in the field he erase-r erineiure for nctnetin the :intoma out. magnetizing coil.

A It L, the motionof [which in one. direction-is .in' the opposite direction by aspri'ng In; in

of the. dynamo frame and connected toth brushes causes the cut-i111 11 m The accompanying drawingshows a. form of the realization of the invention. The generator is supposed; to be of the bipolar type with horizonfial field oles,,thc-fi%urc heingobtaincd by a verticafcut' of th old 6 noles'in the axial line, and also showing the circuit diagrammatically. I

The magnetic yoke of thefdyniimo is in; diczrted at G and thcbrushe; of tho-d'i'narno"l are indicated at 4 4, the main leads fend 3 65 bcing connected to the brushes 4 4.-- Pivoiw ally mounted at ,the point 0 ironsli i limit-ed by step S and and'nfhich-jis urged conductors l and 2, which-are connectedyto P and P" respectively. 7

Provided that the connections are rihfi,

as soon as the dynamo generatesfthe eld produced by the generator armature fadrls its effect to the one of the coil Bfbirt ifnthe storage battery tends to send current .t-lie armature- I, the direction of the nem igo- -fi,cld is reversed and the slip L is repelledb I the zirnmt-ure and is'retracted by the spring; R, the charging current being i;hu auto maticelly cut-out. It will be noticed tl1al1. the fiction of the armature field is added to th e of the spring R when the'valiie of the "reverse current reaches a. certain importance.

. By a. suitable'degree of'se-tura'tion of the v iron slipL any dist rbance of the'comrnd-IOO iii-ion is avoided.

Having now described the nature. of my said invention and in what inanner the same has to be performed, I hereby declare that What I claim is: i

1. A, charging unit comprising in co1n generator in such a way, that the magnetic field produced by this coil assists t he-o ne produced. byv the generator girinature.

2. The combination with a continuous current generate?" of an automatic switch compr sing u-s-lip of magnetic mater-ml on whi'chiis m'o'li'n'ted one :of-the switch contacts" sz iid slip being iivotally mounted and having one end placed-in position to be responsive to the armature flux to open the switch and 'a1 coil connected across the brushes of thefg eneratOEfOr magnetizing said slip.

3. The combination with :r continuous current generator of a-n'automatic switclr .comprising a slip of magnetic material "on wvhich .is mounted one of' t-he s\\"'it ch (ionwas, said slip being pivotally mounted and having one end placed in position to heinfiuenced hy the jurniature flux, and il connected across the'biiu'shes-of the generator for nia'gnetizing S'ziid slip, sziid slip be-=' ing attracted by the armature vhen jthe current flows through: the armature in the" normal direction and-being repelled by the. armature when the gurl'ent reverses therein;

In testimony whereof I have signed my;

name to this specification.

.E-MILE GIRARDEAU. 

